Self-acting siphon



Sept. 10, 1929. w. HEYN 1727,828

SELF ACTING SIPHON Filed June 7, 1927 Patented Sept. 10, 1929.

WERNER HEY'N, 0F HAMBURG, GERMANY.

SEEE-ACTING SICPHON.

Application med June 7, 1927, Serial No. 197,216, and in Germany August2, 192s,

This invention relates to apparatus of the kind in which an overlow ofwater through a tube or conduit is utilized to set up Siphon action insaid tube by carrying bubbles of air from the tube through thetail-water and discharging same into the atmosphere. In such apparatusas heretofore constructed, such discharge has taken place over the loweredge of the Siphon tube, so that in some 1nstances, as the levelv of thetail water rises, the air bubbles which are projected thereinto by theoverfall jet have to traverse an almost vertical path of about 3 metersunder water before reaching said lower edge. Hence the exhausting of theair takes a conslderable time and the setting up of the Siphon action iscorrespondingly delayed. u

The object of the present invention. 1s to provide means for reducing tothe minimum possible, the underwater journey of the air bubbles andthis, quite irrespective of the level of the tail water. j

The invention is hereinafter described with reference to theaccompanylng drawings, in whichz- Figure 1 is a central vertical sectlonof one form of improved Siphon according to the invention;

Figure 2 is a sectional v1ew taken on the line a-b of Figure 1;

Fi re 3 is a view, similar to Figure 1, of a di erent constructionalform of Siphon;

Figure 4 is a sectional view on an enlarged scale of one of the outletledges of Figure 3 and Figure 5 is a sectional view taken on the linec-d of Figure 4.

The means according to this invention consists in the employment ofseveral submerged outlet ledges or recesses T or T1, arranged above andadjacent to each other, the several ledges or recesses either runninground the inner wall of the outfall leg of the Siphon in a horizontalplane as shown at T in Figures 1 and 2 or arranged as illustrated inFigure 3, that is to say, parallel with the back wall and on the innerside of the outer wall of the outfall leg. The ledges T1 runningparallelwith the back wall are arranged at a short distance from the said wall,ex-

tending across the leg between and supported by the two side walls,pipes L therefrom being led through the side walls or the outer wall,while the ledges T in the outer ,Wall are of similar' construction tothose illustrated in Figures 1 and 2.

Each of these outlet ledges, when submerged by the rise of the tailwater in the Siphon, constitutes a partition wall between the Siphonchamber and the outer air, so that the overfall jet can expel the airbubbles from the Siphon chamber, through several of the outlet ledgessimultaneously. The air from the bubbles collecting at each individualledge reaches the outer air by a separate pi e L..

ach of the pipes L terminates either in a flap-valve, with a verticallydepending flap L1, as shown in Figures 1 and 2, or, after passing overthe summit of the Siphon, ends in a chamber A, shut off from theexternal atmosphere and into which a pipe R, open at both ends, entersas far as the level of the head water in the said chamber A, see Figure3. Both the pi es R and the overfall crests can be adjusta lyconstructed, and are therefore capable of being adapted to differenthead water levels, for example, summer and winter levels.

To reinforce the Suction at the start of the 80 action of the Siphon,one or two Side siphons are provided in the lateral walls of the mainSiphon, with their horizontal overllow edge running at right angles tothe crest of the main overfall at an elevation corresponding to that ofthe main overflow crest, and there are collecting channels S behind thehorizontal overfiow edge of the Side Siphon or siphons, which collectthe overfall water and discharge it into the tail waters. When the 90head Water level rises above the overflow point inside the Siphonchamber the water at first flows in a thin layer over the crest of themain overfall and over the horizontal overflow edge of the auxiliarySide Siphon or 95 siphons which corresponds in height to the overflowcrest of the main Siphon. The water thus flowing into the channel S ofthe side Siphon or siphons collects in the channel and forms a strongjet which by virtue of the 100 slight inclination of the bottom of thechanbe made of the wedge K, 4to split up an oveinel is directed againstthe submerged ledges reinforcing the suction at the start of theoverflow.

The method of operation of a siphon working Awitha pipe L termina in 'avchamber A (Figure 3) will also now particularly described.

Supposing that the level of the head-.waterV within the ipes Lcommumcating with them,

. and practical experience shows that this overpressure is sui'cient toforce the water in the correspondin chambers A, which has also risen b 1cm., own again to the height of the ove ow point, so that the airbubbles can escape into the atmosphere, by the proper pi R. Y

Itsis to be understood that each pipe L terminates in a separate chamberA which has its appropriate pipe R. The pipes L of those outlet ledgeswhich are not submerged in the tail water are open to the siphon chamberand closed to atmosphere by the water seal in the respective chambers A.Hence, once the siphon action has been started by the escape ofwater-borne air from the Siphon chamber as above described,'the air inthe pipes of the unsubmei'ged ledges is rarefied to the same extent asthat in the Siphon chamber. Thus, in the neighborhood of the siphoninlet there will be, at the commencement of the Siphon action, three-dilerent water levels, namely the head water level, the slightly lowerlevel in the chamber or chambers A appertaining to the submerged ledgeor ledges, and the slightly higher level in those chambers A ap rtaininto the unsubmerged ledges, prodllized by t e rarefaction just referredto. As this low pressure subsists in these chambers A and pipes L at themoment when the respective ledges T or T1 in turn become submerged bythe rise of the tail water, the passage of the air thereinto isfacilitated over ressure beintg there-' after produced which orcos downe4 level of the water in the chamber A suil'iciently to allow thecompressed air to escape through the pipes R. In this way, the siphonicaction is progressive, being augmented as the low increases, and theSiphon will carry away a greater or less volume of water, depending onthe volume flowing to it each second from the head race. l.

In order to accelerate the suction, use can Vber A, pipe L and outletledge fall jet that is thicker than about 0.16 meter, and to divert'itto the neighbourhood of the outlit; ledges in the- Asiplion wall W(Figure When the ow of water to the si hon ceases and-the level of thehead water alls to the level of the overflow point, air is admitted tothe siphon tube through the pipe R, chainor T1, siphon action being thusgradually checked. In many cases, however, an arr ement such as thatillustrated in Figure 1, will be found indispensable.

Having described m invention, I declare that what I claim and esire tosecure by Letters Patent is 1. In a self-acting siphon such asdescribed, -a plurality of outlet leddges in the lower part arranged oneabove, an adjacent to, another adapted to be submerged by the tail waterat various levels of same and to discharge the A simultaneously throughpipes communicating with a plurality said outlet led air carried intothe tail water by the ove all jet.

2i In a self-acting Siphon such as described, a plurality of outletledges in the lower part arranged one above, and adjacent to, another,an air passage adapted to connect each of said outlets with theatmosphere, a water sealed chamber through which said connection toatmowhere is effected, and means determining the sealing and unsealingof said chamber according to the level of the head water.'

3. In a self-acting siphon such as described, a plurality of outletledges in the lower part arranged one above, and adjacent to, anotheradapted to be submerged by the tail water and to discharge from aplurality of said outlets simultaneously air carried into the tail waterb the overfall jet, and a wedge-shaped br ater in the path of theoverfall jet adapted to divert said jet towards a pluralityof the outletledges.-V

4.' In a self-'acting siphon such as described, a plurality of outlet lin the lower part arranged one above, an adjacent to, another adapted tobe submerged by the tail water and to 'discharge from a plurality ofsaid outlets simultaneously air carried into the tail water by theoverfall jet, at least one auxiliary side si hon within the main siphon,and collecting c annels adapted to augment the overfall jet and guideittowards the outlet ledges. v

In testimony whereoI have aixed my signature hereto.

DmING. WERNER HEYN.

